MBTA BUS IN B DORCHESTER JUST BEFORE NOON. LEE AM MARTIN IS LIVE NEAR THE SCENE. THIS WAS ON THE CHALK. SHE WAS WALKING ACROSS AND THE BUS WAS TRYING TO TURN LEFT. BY THE TIME WE ARRIVED, IT WAS JUST BOOTS LEFT IN THE STREET. DEFINITELY SHOCKING. I HAVE NEVER SEEN NOTHING LIKE IT. WITNESSES STUNNED AFTER A WOMAN IN HER 70'S CRITICALLY INJURED BY AN MBTA BUS. THE WITNESS AND MBTA POLICE TELL US THE WOMAN WAS CROSSING COLUMBIA ROAD AROUND 11:30 WHEN THE ROUTE 41 BUS SLAMMED INTO HER, RIGHT IN THE CHALK. CROSS WALK. THE BUS WAS TRAVELING FROM DUDLEY STREET AND TURNING LEFT ON TO COLUMBIA ROAD. SANTOS SAYS THE WOMAN WAS LYING STILL FOR 15 TO 20 MINUTES AND DID EVENTUALLY MOVE BUT SAID HER WOUNDS WERE SEVERE. WHEN THE E.M.T.'S CAME BOTH OF HER LEGS WAS OFF. IT WAS A CRAZY SIGHT TO SEE. REALLY SO SORRY FOR THE OLD LADY, YOU KNOW, I HOPE SHE WILL BE OKAY. THE WOMAN WAS RUSHED TO BOSTON MEDICAL CENTER. NO WORD ON HER CONDITION. WITNESSES SAID THE DRIVER COULD BE HEARD SAYING THE GLARE FROM THE SUN OBSTRUCTED HIS VIEW. TRANSIT POLICE SAY A FULL INVESTIGATION IS UNDERWAY. DRUG AND ALCOHOL TESTING IS STANDARD PROCEDURE FOR MBTA EMPLOYEES INVOLVED IN ACCIDENTS. THE DRIVER AT THE HOSPITAL